Gas sorption and transport in thermally rearranged polybenzoxazole membranes derived from polyhydroxylamides

Title
Gas sorption and transport in thermally rearranged polybenzoxazole membranes derived from polyhydroxylamides
Authors
이영무
Keywords
POLY; SEPARATION MEMBRANES; INTRINSIC MICROPOROSITY; MER MEMBRANES; GLASSY-POLYMERS; CARBON-DIOXIDE; TROGERS BASE; CO2 CAPTURE; PERMEATION; PLANT; DIFFUSION
Issue Date
2015-01
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MEMBRANE SCIENCE, v. 474, Page. 122-131
Abstract
The sub-nano-sized microcavities in microporous thermally rearranged (TR) polymers can be tuned by varying the conditions of thermal rearrangement. Relatively small cavities were formed by thermal rearrangement of poly(o-hydroxylamide) (PHA) precursors compared to the cavities formed by that of polyimide precursors. TR polymers derived from PHAs, so-called TR-beta-polymers, are known to exhibit a well-tuned cavity structure that can be used for H-2/CO2 separation. According to a solution-diffusion model, both the permeability and selectivity for H-2/CO2 separation were improved at elevated temperatures due to a significant increase in H-2 diffusion and a decrease in CO2 sorption. In this study, gas solubility and permeability of five representative small gas molecules (H-2, N-2, O-2, CH4, and CO2) through TR-beta-polymer membranes were characterized between 20 degrees C and 65 degrees C for gas solubility measurement and between 35 degrees C and 300 degrees C for gas permeability measurement. These measurements allowed for the calculation of thermodynamic factors such as the activation energy and heat of sorption. (C) 2014 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11754/21205http://www.sciencedirect.com/science/article/pii/S0376738814007534
ISSN
0376-7388
DOI
http://dx.doi.org/10.1016/j.memsci.2014.09.051
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > DEPARTMENT OF ENERGY ENGINEERING(에너지공학과) > Articles
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